My Math Forum What in terms of x, is 30% of 3y?

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 July 28th, 2014, 04:56 PM #1 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 What in terms of x, is 30% of 3y? If 30% of y is equal to x, what, in terms of x, is 30% of 3y? 30% of y=$\displaystyle \frac{30}{100}\times{y}=\frac{3}{10}\times{y}$ $\longrightarrow$ $\frac{3}{10}\times{y}=x$ 30% of 3y =$\frac{3}{10}\times3y$ What do I make of these? Last edited by Chikis; July 28th, 2014 at 05:17 PM.
 July 28th, 2014, 06:10 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,681 Thanks: 2659 Math Focus: Mainly analysis and algebra $$3y = 3 \times y \\ a \times ( b \times c ) = a \times ( c \times b ) = ( a \times c ) \times b$$ Because multiplication is both commutative and associative.
 July 28th, 2014, 06:39 PM #3 Senior Member     Joined: Nov 2013 From: Baku Posts: 502 Thanks: 56 Math Focus: Geometry 30% of y is equal to x means 0.3y=x, 30% of 3y means 0.3*3y=3*0.3y=3x......
 July 28th, 2014, 06:48 PM #4 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 .3y = x .3(3y) = 3x or 3(.3y) = 3x (each side has been multiplied by 3) I see you're still wearing your priestly robe, Chikis... Do you sell holy water? Last edited by Denis; July 28th, 2014 at 06:51 PM.
 July 28th, 2014, 09:41 PM #5 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 So what, in terms of x, is 30% of 3y?
July 28th, 2014, 09:52 PM   #6
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 Originally Posted by Chikis So what, in terms of x, is 30% of 3y?
Oh my God. I just committed suicide (And was resurrected ).

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### If 30% of y is equal to x, what in term of x is 30% of 3y?

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